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Open for CommentEPA· Environmental Protection AgencyProposed RuleEPA-HQ-OAR-2025-3297

Tier 4 Criteria Pollutant Standards, Part 1: Phase-In Schedule for Light-Duty and Medium-Duty Vehicles

Introduced May 18, 2026Comment period ends July 7, 2026View on regulations.gov ↗

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Details

TypeFederal Regulation
AgencyEPA · Environmental Protection Agency
DocketEPA-HQ-OAR-2025-3297
Regulations.gov IDEPA-HQ-OAR-2025-3297-0001
IntroducedMay 18, 2026
Comment DeadlineJuly 7, 2026

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